Reference Guide

720 | Quality of Service (QoS)
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• Weighted Random Early Detection
• Create WRED Profiles
• Pre-calculating Available QoS CAM Space
Figure 40-1. Dell Networking QoS Architecture
Implementation Information
The Dell Networking QoS implementation complies with IEEE 802.1p User Priority Bits for QoS
Indication. It also implements these Internet Engineering Task Force (IETF) documents:
• RFC 2474, Definition of the Differentiated Services Field (DS Field) in the IPv4 Headers
• RFC 2475, An Architecture for Differentiated Services
• RFC 2597, Assured Forwarding PHB Group
• RFC 2598, An Expedited Forwarding PHB
You cannot configure port-based and policy-based QoS on the same interface.
Port-based QoS Configurations
You can configure the following QoS features on an interface:
Note: Egress rate shaping and ingress rate policing cannot be simultaneously used on the same VLAN.
Packet
Classification
(ACL)
Ingress
Packet
Processing
Marking
(DiffServ,
802.1p, Exp)
Rate Policing
Buffers 
Class-based
Queues
Congestion
Avoidance
(WRED)
Egress
Packet
Processing
Traffic
Shaping
Egress
Congestion Management
(WFQ Scheduling)
Rate Limiting
Buffers 
Class-based
Queues
Switching